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- W2891998307 abstract "Optical emission and ion time-of-flight are measured for a spark-coupled laser aluminum plasma. A Q-switched Nd:YAG laser (wavelength λ = 1064 nm, pulse width τ ∼ 7 ns, pulse energy Ep ≤ 260 mJ, intensity I ≤ 15 × 109 W/cm2) generates the Al plasma, while a synchronized spark-discharge enhances the ion flux and charge state. Time-integrated, spatially-resolved optical spectra are used to obtain the plasma excitation temperature Te and density ne. The coupling of 2.4 J of spark-discharge energy to the laser plasma enhances the optical emission line intensity. The effective ion temperature Ti is calculated from a shifted Maxwell-Boltzmann distribution fit of the time-of-flight signal deconvolved for each ion charge. For I = 3.5 × 109 W/cm2, Ti is ∼15 eV. For a spark energy of 2.4 J coupled to the laser plasma, Ti increases to ∼50 eV and up to Al8+ is identified from the ion time-of-flight signal. The Ti obtained from the ion time-of-flight is much larger than Te obtained from optical spectroscopy, although the plasma is considered to be in local thermodynamic equilibrium. This result is explained in view of the temporal development of the ablation plume and the different plasma regions probed by the two methods." @default.
- W2891998307 created "2018-09-27" @default.
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- W2891998307 date "2019-04-01" @default.
- W2891998307 modified "2023-10-16" @default.
- W2891998307 title "Diagnostics of a spark-discharge coupled to laser aluminum plasma by optical emission spectroscopy and ion time-of-flight" @default.
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- W2891998307 doi "https://doi.org/10.1016/j.optlastec.2018.09.013" @default.
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